Strainer.



G. W. COLLIN.

STRAENER.

APPLICATION FILED MAY 14, I913.

Patented Sept. 26, 1916.

UNITED STATES PATENT oEEIoE.

GEORGE W. COLLIN, 0F BRIDGEPOR-T, CONNECTICUT, ASSIGNOR, TO THE COLLINVALVE COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF MAINE.

STRAINER.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Application filed May 14, 1913. Serial No. 767,585.

To all whom it may concern Be it known that l. (irnoron W. COLLIN,

' F airfield, and State of Connecticut, have invented certain new anduseful Improvements in Strainers, of which the following is aspecification.

My invention relates to improvements in strainers, and embodiesimproven'ients upon the strainer illustrated and described in my PatentNo. 1,038,544 dated July 23, 1912. The strainer of that patent comprisesa screen cylinder set within a chamber of a suitable body, said bodyhaving passages leading to and from such chamber and so arranged thatthe fluid to be strained passes into the interior of the strainer, andthence out through the perforations thereof into the said chamber andthen out through the discharge passage of the said body. The inventionherein described comprises means for cleaning the surfaces of thestrainer, and other features all as hereinafter described andparticularly pointed out in the appended claims. I I The object of myinvention is to facilitate ithe cleaning of strainer cylinders and theike.

I will now proceed to describe my invention with reference to theaccompanying drawings, and will then point out the novel features inclaims.

Figure 1 shows a central vertical section of a strainer embodying myinvention.

Fig. 2 shows a transverse section of the screen cylinder showing-a topview of the sweep, a portion of this sweep being broken away. Fig. 3shows a detail axial section of the sweep. Fig. 4 is a perspectiveviewof the sweep, showing particularly the staggered arrangement of thenotches of the sweep disks.

In the drawings, 10 designates the strainer body, 11 the inlet passagethereof and 12 the outlet passage thereof. strainer body there is abridge 13 ported at the top for the reception of the screen cylinder 14.The body 10 has as a continuation of inlet passage 11, a passage '15leading to the space above the bridge 13; and thescreen cylinder 1%extends through this space above the bridge 13, and is provided Withinthis der. The body 10 is provided with a cover 17, the screen cylinderfitting into a recess in that cover, and also being stepped in acorresponding recess in the bottom of the body 10. In the bottom of thebody 10, a cleaning port 18 is provided, to which is connected ablow-off pipe 18 provided with a suitable valve 18'. This valve ispreferably placed several feet from the body 10, the pipe 18 therebyaffording a chamber to receive the heavier foreign matter separated fromthe fluid by the screen cylinder l-l.

Into the central opening of the cover-17 is screwed a stuiiing box 1!)through which passes the stem 20 of a sweep 21; and this stuiiing box isprovided with suitable packby a screw cap 23. The sweep 21 comprises aplurality of disks 24 of a diameter suchthat they fit the inner surfaceof the screen cylinder 14 closely, these disks being notched at theedges, the notches of the different disks being staggered relatively, sothat the projections of the one disk are over the notches of the otherdisk, as indicated particularly in Fig. 1. Since the disks are notchedasshown, free flow of liquid past the disks-is permitted, even when thesweep is in an intermediate position, as shown in Fig. 1; though inpractice aml except when the screen cylinder is being cleaned out by thesweep, said sweep will be drawn up to the extreme top of the screencylinder, and will be held there by a clamping collar 25 provided with aset screw 26 whereby the collar may be clamped to any portion of thesweep stem 20.

The operation of the strainer is as follows: Normally, the sweep 21being at the top of the screen cylinder 14, the fluid to be screenedenters the admission passage 11 and, passing through passage 15, entersthe ports 16 of the screen cylinder, and thence passes down through saidscreen cylinder and out through the perforations thereof into thechamber 27 and thence into the outlet passage 12. To clean the screen,the set screw 26 of the clamping collar 14 is loosened and said collaris moved to the top of the stem and there fastened, and then the sweepis moved up and down in the screen cylinder, whereby material adheringto the inner surface of the screen cylinder is scraped therefrom andcaused to fall into theblowoff pi )e 18. The stem 20 is then raised tothe fu 1 height and clamped in that position by means of the clampingcollar 25, and at a suitable time the solid matter in pipe 18' is blownout by opening valve 18*.

As shown particularly in Fig. 3, the sweep 21 comprises a bushing 28mounted upon the end of the stem 20, a nut 29, and spacing rings 30which space the disks 24 apart; these disks being mounted upon thebushing 28. A pin 31 holds the disks 24 in proper relative position, sothat the notches of the disks are always staggered. There may be few ormany of these sweep disks 24. In the particular construction shown twoof these disks are provided, but this number may be greater. I havefound. phosphor-bronze a very suitable material for these disks.

\Vhat I claim is 1. A strainer comprising abody having within it ascreen chamber and another chamber separated from the screen chamber bya perforate wall, said body having also inlet and outlet connections,one connected to the screen chamber and the other to such other chamber,a screen cylinder extending through said chambers and through theperforation in said wall separating said chambers, the portion ofsaidscreen cylinder lying within said screen chamber having screen openings,the portion of said screen cylinder lying Within such other chamberhaving flow ports, a sweep within said screen cylinder and movablelongitudinally therein and arranged to be guided thereby, and

means for moving said sweep.

2. A strainer comprising in combination a body and a screen cylindertherein, a portion of said cylinder provided with screen holes, saidbody provided with passages for the flow of liquid into said screen andout through said holes, and a sweep mounted within said screen cylinderand arranged to move longitudinally therein, said-body having a space,out of the line of flow, into which the sweep may bewithdrawn, and acylinder Within such space and forming an extension of the screencylinder, said screen cylinder and extension forming a guide for thesweep.

3. A strainer comprising in combination a body and a screen cylindertherein, a portion of said cylinder provided with screen holes, saidbody provided with passages for the flow of liquid into said screen andout through said 'holes, and a sweep mounted within said screen cylinderand arranged to move longitudinally therein, said cylinder provided witha portion, beyond the screening portion thereof, into which said sweepmay be drawn.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

GEORGE W. COLLIN.

Witnesses:

H. M. MARBLE,

PAUL H. FRANKE.

